John Henry Devereux, also called John Delorey before 1860, was an American architect and builder best known for his designs in Charleston, South Carolina. According to the National Park Service, he was the "most prolific architect of the post-Civil War era" in the Charleston area. His works are listed on the U.S. National Register of Historic Places. His Charleston Post Office and Courthouse has been designated as a U.S. National Historic Landmark.

Sullivan's Island, historically known as O'Sullivan's Island, is a town and island in Charleston County, South Carolina, United States, at the entrance to Charleston Harbor, with a population of 1,791 at the 2010 census, and 1,891 people in 2020. The town is part of the Charleston metropolitan area, and is considered a very affluent suburb of Charleston.